When I converted my twin bed 27′ Overlander to a double bed, I wanted an office workspace on the street side. The problem was making a desk that didn’t require a chair, but at the same time didn’t obstruct the passageway. I finally hit on a simple translating top, using three full-extension drawer slides. It isn’t perfectly solid when it’s fully out, but it’s way good enough to hold a laptop to type on. If the drawer slides (2 of them) were used vertically at the edges, it would have been more solid, but it would have taken another 3/4″ of height–in retrospect, that’s what I should have done.